6" curves can flow good, or can be a royal headache. A lot of it just depends on where it is. My little table has (2) 6" 1/4 curves and one gives me no issues whatsoever. Heck, I don't even have guard rail on it. The other one causes trouble consistently, and I've gone as far as far as propping it up with a 9" curve to add a little bank to it and it still is a pain with spin outs. It just depends on what leads into them and out of them. Having them at the end of a long straight can be an issue, but if you're driving the worst lane all the time you will get used to it.